Dynamic properties of soils and rocks
We measure what others can only estimate: the actual dynamic behaviour of the subsoil.
Our experimental equipment for measuring dynamic properties (stiffness and damping) of soils includes:
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Resonant column
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Simple cyclic cut
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Cyclic triaxial
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Bender elements and piezoelectric discs
The experimental resonant column system with free-free boundary conditions allows the dynamic properties of rock specimens to be measured. The dynamic characterisation of rock cores is used to calibrate and integrate seismic field data and exploration well logs, as well as for well stability analysis.
Experimental setup for free-free resonance testing and rock specimen instrumented with accelerometers.
The free-free resonant column technique is a small-deformation, non-destructive dynamic test. This technique consists of exciting rock cores torsionally and longitudinally by means of impacts. The response curves are determined, which is the variation in the amplitude of the accelerometers varying with the frequency for the first vibration mode, allowing the resonance frequency of the specimen to be determined and, consequently, the shear or compression wave velocity to be evaluated.